phototube
noun
pho·to·tube
ˈfō-tō-ˌtüb 
-ˌtyüb
: an electron tube having a photoemissive cathode whose released electrons are drawn to the anode by reason of its positive potential
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“Phototube.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/phototube. Accessed 24 Apr. 2024.
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